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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Power Seats) >> Diagnostic Information and Procedures >> Power Seat Malfunction (Power Seat Malfunction (Driver with A45)) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle in Service Mode.
  2. Verify that no DTCs are set.
    • Go to next step: If no DTCs are set 
  3. Verify the appropriate driver scan tool seat switch parameters listed below change between Inactive and Forward/Rearward or Up/Down when pressing the switch.
    • Seat Horizontal Switch
    • Seat Cushion Front Vertical Switch
    • Seat Cushion Rear Vertical Switch
    • Seat Back Switch
    • If the parameter does not change 

      Test or replace the S64D Front Seat Adjuster Switch - Driver.

    • Go to next step: If the parameter changes 
  4. Verify the seat directional motors listed below operate while operating the appropriate seat switches in both directions.
    • M50D Front Seat Tilt Adjuster Actuator - Driver
    • M51D Front Seat Adjuster Actuator - Driver
    • M55D Front Seat Vertical Adjuster Actuator - Driver
    • M56D Front Seat Recliner Actuator - Driver
    • If any seat motor does not operate 

      Refer to Circuit/System Testing.

    • Go to next step: If all seat motors operate 
  5. A fault is currently not present and may be an intermittent condition.
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